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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Phase Transformation Across Multiscale Material Interfaces
Presentation Title Grain Boundary Microstates under Irradiation: Which Came First?
Author(s) Mitra L Taheri, Osman El-Atwani, Asher Leff, Khalid Hattar, James Nathaniel, Blas Uberuaga
On-Site Speaker (Planned) Mitra L Taheri
Abstract Scope Understanding the sink efficiency of interfaces under irradiation is of paramount importance to tailoring materials for radiation tolerance. Using in situ irradiation coupled with precession electron diffraction analysis, defect absorption was tracked under increasing dose. Denuded zones were found to collapse in the absence of any detected changed in macroscopic degrees of freedom of the grain boundaries, and at different doses. Since a change in sink efficiency is likely due to a change in point defect mobility within the boundary. A change in microscopic character likely occurred, possibly due to the formation of extrinsic defects on the boundary. To analyze this further, simulations were used to explore grain boundary microstates loaded with defects and assessed for vacancy formation energies. Overall, the results present a foundation for improving sink efficiency descriptions under irradiation, and take a step forward in understanding complex interfacial dependencies.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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